Callback-driven event interface for MPI_T #79
Description
Problem
Currently there is no interface portable across MPI implementations to inquire and get notified about events within the implementation (e.g., a message gets matched, a lock gets acquired, etc.).
Proposal
Create a set of function calls in symmetry with the existing MPI_T cvar and pvar interface to query available events and register callback functions to be called by the implementation when they occur.
Changes to the Text
The necessary text will be integrated into the MPI_T section of the Tools Interface chapter.
Impact on Implementations
- Implementation will be required to implement the query interface to allow portable tools to query available events.
- Implementations will not be required make specific events available to the user via this interface.
Impact on Users
Users (primarily tools) will be able to obtain more fine grained information from within the MPI implementation to give better advice on performance and correctness.